High strength boron-containing cold heading steel for fastener and preparation process thereof

A preparation process and fastener technology, applied in the field of spheroidization-free annealing high-strength boron-containing cold heading steel and its preparation, can solve the problems of insufficient hardenability, unstable performance, low tempering temperature, etc., and achieve excellent quenching Low permeability, strength and hardness, energy saving effect

Inactive Publication Date: 2010-07-14
INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these steel grades are only suitable for the manufacture of small specifications ) fastener products, and for large-scale fasteners, such as fasteners with a diameter of 16-30mm, there are problems such as insufficient hardenability, low tempering temperature (less than 450°C), and unstable performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1 The high-strength fasteners use boron-containing cold heading steel with a diameter of Cold heading steel wire rod, which contains components and their weight percentages are: C 0.21%, Si 0.06%, Mn 0.86%, Cr 0.17%, P0.0069%, S<0.0050%, Al 0.037%, Ti 0.021% , B 0.0013%, 00.0056%, N 0.0052%, and the balance is iron and unavoidable impurity elements.

[0033] The preparation process of the boron-containing cold heading steel for the high-strength fastener is as follows:

[0034] Prepare smelting raw materials according to the composition of boron-containing cold heading steel for high-strength fasteners, and then smelt and refine the smelting raw materials in sequence; at the end of refining, Al ingots are used for final deoxidation, and the [Al] in the composition of the finished product is guaranteed. 全 The mass ratio of / [O] reaches 6.6; then ferrotitanium is added sequentially to ensure that the mass ratio of [Ti] / [N] in the steel reaches 4.0; finally, the ...

Embodiment 2

[0039] Embodiment 2 The high-strength fastener is made of boron-containing cold heading steel with a diameter of Cold heading steel wire rod, which contains components and their weight percentages are: C 0.20%, Si 0.01%, Mn 0.72%, Cr 0.10%, P 0.009%, S 0.005%, Al 0.036%, Ti 0.030%, B 0.0030%, O 0.0013%, N 0.0035%, and the balance is iron and unavoidable impurity elements.

[0040] The preparation process of the boron-containing cold heading steel for the high-strength fastener is as follows:

[0041] Prepare smelting raw materials according to the composition of boron-containing cold heading steel for high-strength fasteners, and then smelt and refine the smelting raw materials; at the end of refining, use Al ingots for final deoxidation, and ensure that [Al] in the finished product composition 全 The mass ratio of / [O] reaches 27.6; then ferrotitanium is added sequentially, and the mass ratio of [Ti] / [N] in the steel reaches 8.6; finally, the boron wire is fed, and the boron ...

Embodiment 3

[0046] Example 3 The high-strength fasteners are made of boron-containing cold heading steel with a diameter of Cold heading steel wire rod, which contains components and their weight percentages are: C 0.20%, Si 0.06%, Mn 0.83%, Cr 0.18%, P 0.010%, S 0.008%, Al 0.056%, Ti 0.030%, B 0.0018%, O 0.0015%, N 0.0043, and the balance is iron and unavoidable impurity elements.

[0047] The preparation process of the boron-containing cold heading steel for the high-strength fastener is as follows:

[0048] Prepare smelting raw materials according to the composition of boron-containing cold heading steel for high-strength fasteners, and then smelt and refine the smelting raw materials; at the end of refining, use Al ingots for final deoxidation, and ensure that [Al] in the finished product composition 全 The mass ratio of / [O] reaches 37.3; then ferrotitanium is added sequentially to ensure that the mass ratio of [Ti] / [N] in the steel reaches 7.0; finally, the boron wire is fed to ens...

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Abstract

The invention relates to high strength boron-containing cold heading steel for a fastener and a production method thereof. The cold heading steel comprises the following components in percentage by weight: 0.15-0.35% of C, less than 0.10% of Si, 0.50-1.20% of Mn, 0.08-0.50% of Cr, less than 0.035% of P, less than 0.035% of S, 0.005-0.080% of Al, 0.005-0.100% of Ti, 0.0005-0.0050% of B, and the balance of iron and impurities. The preparation process comprises the following steps of: firstly, preparing a continuous casting according to the compositions of the boron-bearing cold heading steel; secondly, sequentially heating, roughly rolling, intermediately rolling, finely rolling, and cooling the continuous casting; and finally, packaging the continuous casting in whole rolls and cooling naturally to form the finished product. The high strength boron-bearing cold heading steel for the fastener has low steel grade strength and hardness, good plasticity and excellent quenching degree, can simplify the fastener manufacture process, save the energy source and reduce the pollution. The strength of the produced large fastener is above the level 8.8. In addition, the preparation process of the high strength boron-bearing cold heading steel for the fastener has simple preparation process, easy implementation and low cost.

Description

technical field [0001] The present invention relates to a steel for fasteners and a production method thereof in the technical field of metal materials, in particular to a high-strength boron-containing cold heading steel without spheroidizing annealing and its preparation for manufacturing 8.8 and 9.8 fasteners craft. Background technique [0002] In 2008, the output of fasteners in my country was as high as 5.6 million tons, and one of the main products was 8.8 and 9.8 high-strength fasteners. At present, the general process of manufacturing 8.8 and 9.8 fasteners is "hot-rolled wire rod→spheroidizing annealing→drawing→cold heading→quenching and tempering treatment", and the spheroidizing annealing process consumes a lot of energy, takes a long time and causes serious environmental pollution. , not only increase the production cost, but also cause metal loss. Therefore, in order to save energy, reduce production costs, simplify the production process, and meet increasingl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/32B21B37/74C21C7/06
Inventor 何毅甘望益陈树铭齐振余杨浩高利容周蕾邓峰云峰公雄
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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